Steam stamp-mill



(No Model.) Y '3 Shets-Sheet 1.. W. H. THOMPSON: STEAM STAMP MILL.

No. 304,471. Patented Sept. 2, 1884.

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(No Model.) 3 Sheets-Sheet 3.

W. H; THOMPSON.

- STEAM STAMP MILL. No. 304,471. 7 4 Patented Sept. 2, 1884.

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N. PETERS. Pnowumn m hu, Washington. D c.

I rrn rnrns WILLIAM H. THOMPSON, or CLEVELAND, OHIO.

STEAM STAMP-MILL.

SPECIFICATION forming part of Letters Patent No. 304,471, dated September 2, 1884.

Application filed October 6, 1883. (No model.)

To all whom it may concern- Be it known that I, IVILLIAM H. THOMP soN, of the city of Cleveland, county of Guyahoga, and State of Ohio, have invented certain new and useful Improvements in Steam Stamp-Mills ofthe class that use only a single stamp-shaft, and used for pulverizing metalliferous or mineralized rock, of which the following is a specification.

My improvements consist, first, of a new arrangement of steam cylinders and pistons, from which I obtain the power for producing the reciprocating vertical motion of the stampshaft, by which I am able to obtain a more powerful action of the stamp-shaft on the downstroke, increasing its pulverizing capacity to a greater extent'than has been heretofore obtained, also to limit the stroke of the steam-pistons and stamp-shaft, so as to prevent any traveling beyond prescribed limits; second, a valve-motion for operating the main steam-valve, whereby the machine is enabled to maintain its own motion automatically; third, the mechanism for rotating the stampshaft automatically, so as to expose the rock material in the mortar or rock receptacle to a more uniform pulverization than by the usual means, and the face of the stamp head or die is subject to an even abrading action, whereby the face of the stamp-head will be preserved in the best condition until worn out.

In the accompanying drawings, Figure 1 is a general side elevation, and Fig. 2 is a general front elevation, of a steam stamp-mill in which my improvements are shown located. Figs. 3, 4, 5, 6, 7, 8, 9 show my improvements drawn on an enlarged scale for more complete illustration and explanation than could be had from the small scale at which the general elevations Fig. l and 2 are drawn, said Figs. 3, 4, 7 ,l 8, and 9 being detached sections.

In the drawings like letters of reference indicate like parts in the several figures.

In the general elevations Figs. 1 and 2, A is the main sills or principal bottom sections of the frame of the machine, which are bolted securely to the foundation; B, the upper frame, suitably designed and constructed so that the machine shall be entirely self-contained and at the top form a substantial seat for the steam-cylinders for producing the rehead or die at the bottom end of the stampshaft. 7

My improvements, as seen and located in the general elevations Figs. 1 and 2, are, first, steam-cylinders J and K, steam piston rod 0, main valve-chest L, inlet steam-pipe M, and

the exhaust-pipe N N, for producing the vertical reciprocating motion of the stamp-shaft; second, steam-cylinder 0, Figs. 1, 2, and 6, with its operating-valve chamber, and valve 9, valve-arms 14, connecting valve-rod P with the hand-wheel screw adjustment Q, arm f, rock-shaft R, and lever S, connected to ring is on the buffer-box D, connected with piston-rod 0, receiving motion therefrom, which constitute the-automatic valve-motion for operating the 'main steam-valve of cylinders J and K, Figs. 5 and 6; third, the steam-cylinders T, having valves and valve-motions adapted to produce rotary action, coupled at right angles to the cranks a a on crank-shaft U, worm V, Worm-wheel \V, spur-pinion X, and spurwheel 1. This latter is keyed to the stamp shaft E, constituting the device for rotating the stamp-shaft, Figs. 1 and 3.

Fig. 5 is a vertical section through the center of the steam-cylinders J and K, valvechambers L, and main Valve-cylinder 0.

Fig. '6 is an external elevation of the cylinders J and K, steam valve-chamber L, with the steam-cylinder 0 shown in vertical section, the piston-rod O, buffer-box connection D, and top end of the stamp-shaft E, together with the levers and rods for operating the valve of cylinder 0. The top steam-cylinder, J, is central with the larger bottom cylinder, K, and bolted thereto by a flange-connection at 1. Thelarger or bottom steanrcylinder, K, stands upon its bottom head, and bolted thereto by the flange at 2. This bottom cylinder-head forms also the upper portion or cap for the frame of the machine. The diameter of the steanrcylinder J should be such as will give an aggregate steam-pressure of the piston sufficient to impart to the stamp-shaft on the downstrcke the desired energy of action or force with which the stamp-head will strike the rock material to be pulverized; The diameter of the steam-cylinder K, Fig. 5, should be such as to give an aggregate steam-pressure on. the piston 3 sufiicient to counterbalance the steam-pressure on piston 4, together with the weight of p the stamp-shaft, pistons, and rods, &c., and leave a surplus steam-power sufficient to make the upstroke with the desired velocity. The bottom end of the cylinder J and top end of the cylinder K are open one into the other, and the chamber or space so formed between the piston 3 and piston 4 is open at all times to the atmosphere through the exhaust-pipe N, Fig. 5. i

The steam-pistons 3 and 4 are both fixed upon the same piston-rod O, the upward strok e of which will be made by admitting steam below the large piston 3, which being exhausted at the termination of .the upward stroke, the downward stroke will be made by the steam action upon piston h The steampassage 5, leading from main valve-chamber L to the top end of cylinder J, is at all times in free communication with the valve-chamber L, Figs. 1, 5, and 6, and not subject to valve action, leaving the steam constantly acting on the top side of the piston 4. n, the inlet steam-port from the main Valve-chamber to the bottom end of the cylinder K. For the main steam-valve 6, although not a necessity, I

. prefer what is known as a "balanced valve,

inasmuch as the relief of the steam load upon the valve promotes a more prompt valve action. This valve is only single-acting, admitting steam to and from the under side of piston 3, only the exhauststeam passing ed to the atmosphere through the exhaust-chamber Z and the exhaust-pipe N, Figs. 5 and 6. Toward or near the bottom end of cylinder K, commencing at the bottom of the inlet steamport a, Fig. 5, and extending upward to about half an inch less than the face depth of piston 3, is a'ehamber, 7, about half an inch larger in diameter than the workingbore ofthe cylinder, which arrangement is for arres'ting the working of the machine when from any accidental derangement or neglect the pistons go below the prescribed limit of stroke, and to prevent the piston 3 striking the bottom cylinder-hcad. The ordinary conditions of work ing the downward stroke will be determined by the stamp-head striking the rock material, and during this condition no means are necessary in the cylinder for arresting the travel of the piston downward. Should, however, the feeding of the machine be neglected or some accidental derangement occur and allow the piston to descend beyond its prescribed limit of stroke, the bottom edge of the piston 3 will then have passed the bottom edge of the chamber 7, Fig. 5, and have entered the lower section, of the cylinder, the diameter of which is the same as the diameter of piston. The inlet steam-port-n will then be shut off from the under side of the piston, and the steam, being trapped in the bottom end of cylinder, will prevent the piston descending so as to strike the bottom cylinder-head. At the same time the upper edge of the piston will have descended below the top edge of the chamber 7 and so allow the inflowing steam to pass around the piston intothe upper end of the cylinder and escape through theexhaustpipe N, and further working of the machine will be arrested until the irregularity has been corrected. The upward stroke will be determined by the piston 4 closing the port at of the cylinder J, and thereby trapping the steam in the upper end of the cylinder, and so preventing further motion in that direction. This action will occur at every stroke with more or less intensity, and the entrapped steam above the piston will be more or less compressed and correspondingly increased in pressure, which will accordingly accelerate the return or downward stroke of the stamp-shaft. The main steam-valve 6, Fig. 5, is operated by power obtained from the steamcylinder 0, connected to the top side of the main valve steam-chest L, the steam-piston r, Fig. 6, being directly connected to the top end of the main-valve stem 8, the operatingvalve 9 and inlet and outlet steam-ports 10 being of the usual construction to admit steam to and from either end of the cylinder, to produce a reciprocating piston motion. Each side of the pistonr, Figs. 5 and 6, is a trunkextension, ti, both of equal diameter, each provided with packing-rings, so that each trunk will-operate as an ordinary single-acting trunk-piston. These trunk-pistons work in steam-cylinders 17 17, of corresponding diameter.

To the top end of the top trunk-cylinder,17,

and to the bottom end of the bottom trunkcylinder, 17, the steam from the steam-chest L has free access through the ports 11 and 12. These ports are at a proper distance from the end of each trunk-piston to admit of a pistontravel equal to the stroke of the main valve 6 at the prescribed limit of the piston-stroke in either direction. The trunk-piston will close the ports 11 or 12, thereby trapping the steam in that end of the trunk-cylinder and preventing further travel in that direction, thus alternately moving the main steam-valve 6 without injurious jar.

The motion of the operating-valve 9 of the steam-cylinder 0, Fig. 6, is obtained from the movement of the piston-rod G. On the top end of the buffer-box connection D, attached to the piston-rod O, is a square groove, 13. Into this groove is fitted the ring is, Fig. 8, which is formed in two halves and bolted together by bolts through the lugs i, so as to form one ring. 011 each side of this ring is a journal, h h. Each journal is connected by a suitable link with corresponding journals, 9 9, connected with the forked end of lever S. (Another view of lever S is seen in Fig. 7.) Lever S is fixed to the rock-shaft B. On one end of said rock-shaft R is .an arm, f, to which is attached the rod P, Fig. 6, which extends to and in connection with the arm 14 on the stem of the valve 9 of cylinder 0. This rod P is in two sections, connected about the middle by right and left screwed ends into the hub of the hand-wheel Q, which admits of the rod being lengthened or shortened,'so as to obtain a proper relative adjustment between the valve 9 of cylinder 0 and main valve 6.

The device for rotating the stamp-shaft is shown on an enlarged scale in Figs. 3 and 4, where Fig. 3 is an elevation, with the supporting portions of the frame B shown in section. Fig. 4 is a plan view of the same. T T are two steam-cylinders fixed to the frame of the machine, each cylinder having suitable pistons, with pistonrods attached to cranks a a, set at right angles, one on each end of the crankshaft U. No valves or valve-motion for these steamcylinders is shown in the drawings, it being understood that any ordinary construction of valves and valve-gear adapted to producerotary motion being sufficient. The worm V is fixed upon the crank-shaft, and worm-wheel WV gears with the worm V on the crank-shaft, and fixed on the top end of the shaft 15. The spur-pinion w is fixed on the shaft 15, and having a sufficient breadth of face to keep in gear with the spur-wheel 1, as it moves vertically with the stamp-shaft, through the whole stroke, the spur-wheel 1 being fixed to the stampshaft, so as to rotate the sam'e, and moves ver tically with it, and through the entire stroke gears with pinion m. It will be understood that by the rotation of the crank-shaft U, worm V and worm -wheel W, spur-pinion ac, and spur-wheel 1 a slow rotary motion will be imparted to the stamp-shaft E, Figs. 1,3, and 6.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. Steam-cylinders J and K, provided with pistons 4 and 3, piston-rod O, valve-chamber L, steanrvalve 6,and valve-stem 8, in combination with the buffer-bore connection D, stampshaft E, mortar G, anvil-block H, main sills A, and a suitable supporting-frame, substantially as described, and for the purpose set forth.

2. The steam-cylinder J, provided with the steam-passage 5, and steam-port m, and exhaust-port N, in combination with the valvechamber L, steam-cylinder K, steam-pistons 4 and 3, and piston-rodO, substantially as de-' scribed, and for the purpose set forth.

3. In the steam cylinder K, the chamber 7 and cushioning-chamber K, in combination with the steam-port n, valve-chamber L, steamvalve 6, valve-stem 8, steam-cylinder J, steampistons 3 and 4, and piston-rod G, substantially as described, and for the purpose set forth. p

' 4. Steam-cylinder O, steam-piston r, trunkpistons 16 t, and trunk-cylinders 17 17, with a valvechamber and valve, in combination with the valve-chamber L, steam-valve 6,valv,e-stem 8, and steam-cylinders J and K, substantially as described, and for the purpose set forth.

5. Valvearm 14, valve-rod P, hand-wheel Q, arm f, rock=shaft R, lever S, and ring 70, in combination with the piston-rod C, buffer-box connection D, stamp-shaft E, steam-cylinder 0, and steanrvalve 9, substantially as described, and for the purpose set forth.

6. Steam-cylinders T T, with their pistons and piston-rods, crank a a, crank-shaft U, Worm V, worm-wheel W, shaft 15, spur-pinion w, and spur-wheel 1, in combination with the stamp-shaft E, with a supporting-frame, B, substantially as described, and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses. 1

WILLIAM H. THOMPSON.

Witnesses:

W. H. BURRIDGE, J. H. BURRIDGE. 

